#canvas1 {
  /* border: 5px solid #000; */
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
}
#controls {
  position: absolute;
  z-index: 10;
  top: 50px;
  left: 50%;
  transform: translateX(-50%);
}
#controls, select, option {
  font-size: 25px;
}